BYU students stage peace rally, B1.Anti-war protests grew disruptive, flights overseas were curtailed, airports and nuclear plants stepped up security against terrorist attacks and children cried with the approach of zero hour Tuesday in the Persian Gulf.

Churches around the nation hummed with prayer in the final hours before the U.N. deadline for Iraq to get out of Kuwait. San Francisco declared itself a sanctuary for war resisters. And in a throwback to the '60s, teach-ins were held from the Massachusetts Institute of Technology to the University of Washington.Students "don't know enough about this," said MIT teach-in organizer Geetha Krishnan. "A lot of students are apathetic. This should help raise awareness."

Churches in a dozen countries and every state planned to ring their bells at noon in a solemn message: Make peace.

Demonstrators burned a flag and a police officer was hit in the head with a stick in a protest by 1,000 in Minneapolis. In Seattle, 30,000 took part in a candlelight march against war. Protesters stopped traffic on the Golden Gate Bridge in San Francisco and took over the post office in Iowa City, Iowa.

More than 100 people were arrested in Chicago during the morning rush hour when 5,000 protesters - many shouting, "No blood for oil!" - blocked streets and marched into the building housing Amoco Corp. headquarters.

Dick Gregory, comic turned social activist and diet expert, was arrested outside the White House trying to give a letter to President Bush. He returned and was arrestedtwice more. Across the street, American Indians beat a peace drum.

Children demonstrated at a recruiting station in New York's Times Square. "I'm angry," said Erlind Kelly, 11. "My uncle's probably going to die for oil. Who cares about oil?"

Power plants were under Nuclear Regulatory Commission instructions to guard against terrorism. Airports, factories and Wall Street also buckled down. International firms have cut travel to Europe and the Middle East. The New York Stock Exchange double-checked IDs and barred lunchtime food couriers.

Pan Am and Trans World Airlines suspended service to some cities in Europe and the Mideast.

Robin Zachary, a 30-year-old free-lance graphic designer in New York City, said the potential for terrorism made her fearful about taking the subway for an assignment Tuesday. "In the back of my mind there is this looming feeling of doom," she said. "The thought does cross my mind maybe I shouldn't bother getting my work done at all. Who knows what things will be like by the end of the week?"

In Los Angeles, prominent Arab-Americans met with FBI officials to demand they stop sending agents to interview people of Arab background about potential Iraqi terrorism. They said the meetings impugn Arab-Americans' loyalty.

"Here I am being picked out because my last name is Arabic," said David Najjab, a Dallas photographer interviewed by an FBI agent. "As an American I don't need to be told I should call the FBI if I was told someone planned to blow up buildings."

The San Francisco Board of Supervisors voted unanimously Monday to make the city a sanctuary for anyone choosing not to take part in a war with Iraq. It joins Madison, Wis., in doing so. The resolution means the city won't spend money helping the government find or prosecute AWOL soldiers or draft-dodgers.

Rock station KOCD-FM in Joplin, Mo., broadcast John Lennon's "Give Peace A Chance" without interruption. The Philadelphia Orchestra gave a concert in memory of Martin Luther King Jr. The program on the eve of Tuesday's birthday of the slain civil rights leader was also dedicated to peace in the gulf.

At the Little Red School House in Los Angeles, teachers led youngsters in a rally for peace. "I want war to stop because my brother is in the Middle East and he says it's really bad, and I just don't want him to die," said a tearful 11-year-old Chris Evans. "I think war is really dumb."